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DTC P0A78: Drive Motor "A" Inverter Performance: Wiring Diagram

WARNING: This page is about a different car, the 2015 Subaru XV Crosstrek. However, it is still accessible from the selected car via links, so may be relevant.

Hybrid system < Ref. to WIRING DIAGRAM , Hybrid Electric Vehicle System.>

Fig 1: Drive Motor A Inverter Performance - Wiring Diagram (1 Of 2)
G09479248Courtesy of SUBARU OF AMERICA, INC.
Fig 2: Drive Motor A Inverter Performance - Wiring Diagram (2 Of 2)
G09479249Courtesy of SUBARU OF AMERICA, INC.
DTC PROCEDURE

Step Check Yes No
1 CHECK DETAIL CODE. 
Using the Subaru Select Monitor, confirm the current data of drive motor control system, the value of «Detail code». < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Current Data.>		 Is «Detail code» displayed? If 500 is displayed, Go to step 2  . If 501, 502 are displayed, Go to step 17  .
If 503 - 508 is displayed, Go to step 19  .
NOTE: Check all the counting codes.
 Replace DMCM. < Ref. to appropriate DRIVE MOTOR CONTROL MODULE in Continuously Variable Transmission TH58A article.>
2 CHECK CURRENT DATA. 
Using the Subaru Select Monitor, confirm the current data of drive motor control system, the value of «Drive Motor Inverter Serial Check». < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Current Data.>		 Does the value show «Abnormal »? Perform the diagnosis according to DTC P1C30. < Ref. to DTC P1C30 MANUFACTURER CONTROLLED DTC , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> Go to step 3  .
3 CHECK DTC. 
Read the DTC. < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Diagnostic Trouble Code (DTC).>		 Are any other DTCs detected? (current malfunction) Perform the diagnosis according to DTC. < Ref. to DRIVE MOTOR CONTROL SYSTEM , LIST, List of Diagnostic Trouble Code (DTC).> Go to step 4  .
4 CHECK CURRENT DATA. 
Using the Subaru Select Monitor, confirm the current data of drive motor control system, the values of «Phase U Amperage Sensor Voltage »«Phase V Amperage Sensor Voltage »«Phase W Amperage Sensor Voltage». < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Current Data.>		 Is the value 2.5 V±0.1 V? Go to step 5  . Perform the diagnosis according to DTC P0BE6 and P06B1. < Ref. to DRIVE MOTOR CONTROL SYSTEM , LIST, List of Diagnostic Trouble Code (DTC).>
5 CHECK HARNESS (GATE SIGNAL SHORT TO POWER AND SHORT IN OTHER SIGNAL LINES). 
  1. Turn the ignition switch to OFF.
  2. Disconnect the DMCM connector.
  3. Disconnect the drive motor inverter connector.
  4. Disconnect the intermediate connector (R436).
  5. Using a tester, measure the resistance between DMCM connector and individual connectors.

    Connector & terminal 

    (R442) No. 2 - (R442) No. 1 - 22: 

    (R442) No. 2 - (R443) No. 1 - 26: 

    (R442) No. 2 - (R436) No. 1 - 8: 

    (R442) No. 2 - (R432) No. 7: 

    (R442) No. 1 - (R442) No. 1 - 22: 

    (R442) No. 1 - (R443) No. 1 - 26: 

    (R442) No. 1 - (R436) No. 1 - 8: 

    (R442) No. 1 - (R432) No. 7: 

    (R442) No. 15 - (R442) No. 1 - 22: 

    (R442) No. 15 - (R443) No. 1 - 26: 

    (R442) No. 15 - (R436) No. 1 - 8: 

    (R442) No. 15 - (R432) No. 7: 

    (R442) No. 14 - (R442) No. 1 - 22: 

    (R442) No. 14 - (R443) No. 1 - 26: 

    (R442) No. 14 - (R436) No. 1 - 8: 

    (R442) No. 14 - (R432) No. 7: 

    (R442) No. 13 - (R442) No. 1 - 22: 

    (R442) No. 13 - (R443) No. 1 - 26: 

    (R442) No. 13 - (R436) No. 1 - 8: 

    (R442) No. 13 - (R432) No. 7: 

    (R442) No. 12 - (R442) No. 1 - 22: 

    (R442) No. 12 - (R443) No. 1 - 26: 

    (R442) No. 12 - (R436) No. 1 - 8: 

    (R442) No. 12 - (R432) No. 7: 

 Is the resistance 1 MΩ or more? Go to step 6  . Repair short circuit in harness between DMCM connector and drive motor inverter connector, or repair the intermediate connector.
6 CHECK DRIVE MOTOR INVERTER (SHORT). 
  1. Disconnect the ground cable of the 12 volt auxiliary battery, and as for the 12 volt engine restart battery, disconnect the ground cable from the 12V engine restart battery sensor. < Ref. to BATTERY , NOTE, Note.>
  2. Remove the service disconnect plug. < Ref. to SERVICE PLUG .>
  3. Wait for 10 minutes.
  4. Disconnects power cable (HV2, HV3) and bus bar (HV5) from the drive motor inverter.
    NOTE: Be sure to use insulating tape.
  5. Using a tester, check continuity between drive motor inverter terminals.
    NOTE: When checking voltage values, always follow the combinations as follows with correct polarities. If polarities are reversed when checking, the trouble may not be accurately diagnosed.

    Connector & terminal 

    (HV5) P (+) - (HV2) U (-): 

    (HV5) P (+) - (HV2) V (-): 

    (HV5) P (+) - (HV2) W (-): 

    (HV2) U (+) - (HV5) N (-): 

    (HV2) V (+) - (HV2) N (-): 

    (HV2) W (+) - (HV2) N (-): 

    (HV5) P (+) - (HV5) N (-): 

    (HV2) U (+) - (HV2) V (-): 

    (HV2) U (+) - (HV2) W (-): 

    (HV2) V (+) - (HV2) W (-): 

    (HV5) P (+) - Chassis ground (-): 

    (HV5) N (+) - Chassis ground (-): 

    (HV2) U (+) - Chassis ground (-): 

    (HV2) V (+) - Chassis ground (-): 

    (HV2) W (+) - Chassis ground (-): 

 Is there continuity? Replace the drive motor inverter. < Ref. to INVERTER .> Go to step 15  . Go to step 7  .
7 CHECK DRIVE MOTOR INVERTER (RELEASED). 
Using diode voltage measuring mode on an insulation multimeter, measure the voltage between the terminals of the drive motor inverter.
NOTE: When checking voltage values, always follow the combinations as follows with correct polarities. If polarities are reversed when checking, the trouble may not be accurately diagnosed.

Connector & terminal 
(HV2) U (+) - (HV5) P (-): 
(HV5) N (+) - (HV2) U (-): 
(HV2) V (+) - (HV5) P (-): 
(HV5) N (+) - (HV2) V (-): 
(HV2) W (+) - (HV5) P (-): 
(HV5) N (+) - (HV2) W (-): 		 Is "O.L" indicated? Replace the drive motor inverter. < Ref. to INVERTER .> Go to step 15  . Go to step 8  .
8 CHECK HIGH VOLTAGE UNIT (SHORT). 
  1. Remove electric noise filter, DC/DC converter, and electric oil pump inverter.
  2. Using a tester, check for continuity between terminals of each unit.
    NOTE:
    • When checking voltage values, always follow the combinations as follows with correct polarities. If polarities are reversed when checking, the trouble may not be accurately diagnosed.
    • For ground measuring points of electric noise filter, DC/DC converter, and electric oil pump inverter, refer to Notes in the margin.

    Connector & terminal 

    (HV6) P (+) - (HV7) N (-): 

    (HV6) P (+) - Electric noise filter ground (-): 

    (HV6) N (+) - Electric noise filter ground (-): 

    (HV3) P (+) - (HV3) N (-): 

    (HV3) P (+) - DC/DC converter ground (-): 

    (HV3) N (+) - DC/DC converter ground (-): 

    (HV9) P (+) - (HV9) N (-): 

    (HV9) P (+) - (HV10) U (-): 

    (HV9) P (+) - (HV10) V (-): 

    (HV9) P (+) - (HV10) W (-): 

    (HV10) U (+) - (HV9) N (-): 

    (HV10) V (+) - (HV9) N (-): 

    (HV10) W (+) - (HV9) N (-): 

    (HV10) U (+) - (HV10) V (-): 

    (HV10) U (+) - (HV10) W (-): 

    (HV10) V (+) - (HV10) W (-): 

    (HV9) P (+) - Electric oil pump inverter ground (-): 

    (HV9) N (+) - Electric oil pump inverter ground (-): 

    (HV10) U (+) - Electric oil pump inverter ground (-): 

    (HV10) V (+) - Electric oil pump inverter ground (-): 

    (HV10) W (+) - Electric oil pump inverter ground (-): 

    (HV8) P (+) - (HV8) N (-): 

    (HV8) P (+) - Chassis ground (-): 

    (HV8) N (+) - Chassis ground (-): 

 Is there continuity? Replace the unit that has continuity. Go to step 14  . Go to step 9  .
9 CHECK POWER CABLE AND DRIVE MOTOR (SHORT TO GROUND). 
Using an insulation multimeter (250 V range), measure the resistance between power cable terminals and chassis ground.
Connector & terminal 
(HV2) U - Chassis ground: 
(HV2) V - Chassis ground: 
(HV2) W - Chassis ground: 		 Is the resistance 2 MΩ or more? If you have a milliohm tester at hand, Go to step 10  .
If a milliohm tester is NOT at hand, Go to step 13  .		 Go to step 11  .
10 CHECK POWER CABLE AND DRIVE MOTOR (SHORT). 
Using a milliohm tester, measure the resistance between power cable terminals.
Connector & terminal 
(HV2) U - (HV2) V: 
(HV2) U - (HV2) W: 
(HV2) V - (HV2) W: 		 Is either resistance value less than 25 mΩ? Go to step 12  . Go to step 16  .
11 CHECK POWER CABLE AND DRIVE MOTOR (SHORT TO GROUND). 
  1. Leave the vehicle under temperature of 40°C (104°F) or less for 10 minutes.
  2. Disconnect the drive motor power cable (HV1).
    NOTE: The gasket is NOT reusable.
  3. Using an insulation multimeter (250 V range), measure the resistance between power cable terminals and chassis ground.

    Connector & terminal 

    (HV1) U - Chassis ground: 

    (HV1) V - Chassis ground: 

    (HV1) W - Chassis ground: 

 Does the resistance between any points show less than 2 MΩ? Replace the drive motor assembly. < Ref. to appropriate DRIVE MOTOR ASSEMBLY in Continuously Variable Transmission TH58A article.> Repair or replace the short circuit of the power cable. Go to step 15  .
12 CHECK POWER CABLE AND DRIVE MOTOR (SHORT). 
  1. Leave the vehicle under temperature of 40°C (104°F) or less for 10 minutes.
  2. Disconnect the drive motor power cable (HV1).
    NOTE: The gasket is NOT reusable.
  3. Using a milliohm tester, measure the resistance between power cable terminals and chassis ground.

    Connector & terminal 

    (HV1) U - Chassis ground: 

    (HV1) V - Chassis ground: 

    (HV1) W - Chassis ground: 

 Is resistance between either lines less than 20 mΩ? Replace the drive motor assembly. < Ref. to appropriate DRIVE MOTOR ASSEMBLY in Continuously Variable Transmission TH58A article.> Repair or replace the short circuit of the power cable. Go to step 15  .
13 CHECK DRIVE MOTOR (SHORT). 
  1. Replace the removed/disconnected parts back to the vehicle.
  2. With the 12 V battery connected, remove the service disconnect plug. < Ref. to SERVICE PLUG .>
    CAUTION: Watch for an electrical short at each harness because the 12 V battery is connected.
  3. Lift up the vehicle.
  4. Start the engine, and set the shift lever to "D" range.
  5. Using the Subaru Select Monitor, confirm the current data of drive motor control system, the values of «A/T Oil Temperature»«Drive Motor Speed»«Drive Motor Inverter Input High Voltage Sensor (Serial)». < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Current Data.>
 Are any of the following statements relevant?
  • «Drive Motor Inverter Input High Voltage Sensor (Serial)» is out of the standard specified in Note when «ATF Temperature » is 20 - 60°C (68 - 140°F) and «Drive Motor Speed» is 600 - 1400 rpm.
  • Abnormal noise and changes in rotation speed occur near 600 rpm.
 Go to step 14  . Go to step 16  .
14 CHECK DRIVE MOTOR AND POWER CABLE. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the ground cable of the 12 volt auxiliary battery, and as for the 12 volt engine restart battery, disconnect the ground cable from the 12V engine restart battery sensor. < Ref. to BATTERY , NOTE, Note.>
  3. Disconnect the power cable (HV2) of drive motor inverter.
  4. Disconnect the drive motor power cable (HV1).
    NOTE: The gasket is NOT reusable.
  5. Using an insulation multimeter (250 V range), measure the resistance between power cable terminals.

    Connector & terminal 

    (HV2) U - (HV2) V: 

    (HV2) U - (HV2) W: 

    (HV2) V - (HV2) W: 

 Does the resistance between any points show 2 MΩ or more? Replace the drive motor assembly. < Ref. to appropriate DRIVE MOTOR ASSEMBLY in Continuously Variable Transmission TH58A article.> Repair or replace the short circuit of the power cable. Go to step 15  .
15 CHECK OF DRIVE MOTOR (DEMAGNETIZATION). 
  1. Replace the removed/disconnected parts back to the vehicle.
  2. With the 12 V battery connected, remove the service disconnect plug. < Ref. to SERVICE PLUG .>
    CAUTION: Watch for an electrical short at each harness because the 12 V battery is connected.
  3. Lift up the vehicle.
  4. Start the engine, and set the shift lever to "D" range.
  5. Using the Subaru Select Monitor, confirm the current data of drive motor control system, the values of «A/T Oil Temperature»«Drive Motor Speed»«Drive Motor Inverter Input High Voltage Sensor (Serial)». < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Current Data.>
 «Drive Motor Inverter Input High Voltage Sensor (Serial)» is within the standard specified in Note when «ATF Temperature » is 20 - 60°C (68 - 140°F) and «Drive Motor Speed» is 600 - 1400 rpm. Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.
NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
 Replace the drive motor assembly. < Ref. to appropriate DRIVE MOTOR ASSEMBLY in Continuously Variable Transmission TH58A article.>
16 CHECK DRIVE MOTOR INVERTER. 
  1. Replace the drive motor inverter. < Ref. to INVERTER .>
  2. Perform drive cycle A. < Ref. to DRIVE CYCLE A , PROCEDURE, Drive Cycle.>
 Is the same DTC detected? (current malfunction) Replace DMCM. < Ref. to appropriate DRIVE MOTOR CONTROL MODULE in Continuously Variable Transmission TH58A article.> Problem is present in drive motor inverter.
17 CHECK CURRENT DATA. 
Using the Subaru Select Monitor, confirm the current data of drive motor control system, the value of «Drive Motor Inverter Serial Check». < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Current Data.>		 Does the value show «Abnormal »? Perform the diagnosis according to DTC P1C30. < Ref. to DTC P1C30 MANUFACTURER CONTROLLED DTC , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> Go to step 18  .
18 CHECK DRIVE MOTOR INVERTER. 
  1. Replace the drive motor inverter. < Ref. to INVERTER .>
  2. Perform drive cycle A. < Ref. to DRIVE CYCLE A , PROCEDURE, Drive Cycle.>
 Is the same DTC detected? (current malfunction) Replace DMCM. < Ref. to appropriate DRIVE MOTOR CONTROL MODULE in Continuously Variable Transmission TH58A article.> Problem is present in drive motor inverter.
19 CHECK DTC. 
Read the DTC. < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Diagnostic Trouble Code (DTC).>		 Are any other DTCs detected? (current malfunction) Perform the diagnosis according to DTC. < Ref. to DRIVE MOTOR CONTROL SYSTEM , LIST, List of Diagnostic Trouble Code (DTC).> Go to step 20  .
20 CHECK CURRENT DATA. 
Using the Subaru Select Monitor, confirm the current data of drive motor control system, the values of «Phase U Amperage Sensor Voltage »«Phase V Amperage Sensor Voltage »«Phase W Amperage Sensor Voltage». < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Current Data.>		 Is the value 2.5 V±0.1 V? Go to step 21  . Perform the diagnosis according to DTC P0BE6 and P06B1. < Ref. to DRIVE MOTOR CONTROL SYSTEM , LIST, List of Diagnostic Trouble Code (DTC).>
21 CHECK DRIVE MOTOR INVERTER (INTERNAL SHORT). 
  1. Disconnect the ground cable of the 12 volt auxiliary battery, and as for the 12 volt engine restart battery, disconnect the ground cable from the 12V engine restart battery sensor. < Ref. to BATTERY , NOTE, Note.>
  2. Remove the service disconnect plug. < Ref. to SERVICE PLUG .>
  3. Wait for 10 minutes.
  4. Disconnect the DMCM connector.
  5. Disconnect the drive motor inverter connector.
  6. Using a tester, measure the resistance between DMCM connector and the ground bolt of inverter frame body.

    Connector & terminal 

    (R442) No. 2 - Ground bolt of inverter frame body: 

    (R442) No. 1 - Ground bolt of inverter frame body: 

    (R442) No. 15 - Ground bolt of inverter frame body: 

    (R442) No. 14 - Ground bolt of inverter frame body: 

    (R442) No. 13 - Ground bolt of inverter frame body: 

    (R442) No. 12 - Ground bolt of inverter frame body: 

 Is the resistance 1 MΩ or more? Go to step 22  . Repair short to ground circuit in harness between DMCM connector and drive motor inverter connector, or repair the intermediate connector.
22 CHECK HARNESS (OPEN CIRCUIT). 
Using a tester, measure the resistance between the drive motor inverter connector and DMCM connector.
Connector & terminal 
(R442) No. 2 - (R432) No. 5: 
(R442) No. 1 - (R432) No. 11: 
(R442) No. 15 - (R432) No. 4: 
(R442) No. 14 - (R432) No. 10: 
(R442) No. 13 - (R432) No. 3: 
(R442) No. 12 - (R432) No. 9: 		 Is the resistance less than 1 Ω? Go to step 23  . Repair open circuit in harness between DMCM connector and drive motor inverter connector, or repair the intermediate connector.
23 CHECK POWER CABLE AND DRIVE MOTOR (OPEN CIRCUIT). 
  1. Leave the vehicle for ten minutes under temperature of 40°C (104°F) or less.
  2. Disconnect the power cable (HV2) from drive motor inverter.
  3. Using a tester, measure the resistance between power cable terminals.

    Connector & terminal 

    (HV2) U - (HV2) V: 

    (HV2) U - (HV2) W: 

    (HV2) V - (HV2) W: 

 Is resistance between either lines 1 Ω or more? Go to step 24  . Go to step 25  .
24 CHECK DRIVE MOTOR (OPEN CIRCUIT). 
  1. Leave the vehicle under temperature of 40°C (104°F) or less for 10 minutes.
  2. Disconnect the drive motor power cable (HV1).
    NOTE: The gasket is NOT reusable.
  3. Using a tester, measure the resistance between power cable terminals.

    Connector & terminal 

    (HV1) U - (HV1) V: 

    (HV1) U - (HV1) W: 

    (HV1) V - (HV1) W: 

 Is resistance between either lines 1 Ω or more? Replace the drive motor assembly. < Ref. to appropriate DRIVE MOTOR ASSEMBLY in Continuously Variable Transmission TH58A article.> Repair or replace the open circuit of the power cable.
25 CHECK DRIVE MOTOR INVERTER. 
  1. Replace the drive motor inverter. < Ref. to INVERTER .>
  2. Perform drive cycle A. < Ref. to DRIVE CYCLE A , PROCEDURE, Drive Cycle.>
 Is the same DTC detected? (current malfunction) Replace DMCM. < Ref. to appropriate DRIVE MOTOR CONTROL MODULE in Continuously Variable Transmission TH58A article.> Problem is present in drive motor inverter.
NOTE: Ground measuring points
NOTE: Value of «Drive Motor Inverter Input High Voltage Sensor (Serial)» is proportional to «Drive Motor Speed».
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